Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-09-06
1984-09-04
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310331, 310334, 310335, 310338, 310800, H01L 4108
Patent
active
044699786
ABSTRACT:
An ultrasonic detector is provided wherein electrodes are formed on the front and rear surfaces of a high polymer piezoelectric film, such that opposing electrode portion and nonopposing electrode portions are alternately and continually formed, most parts of the electrodes on the front and rear surfaces being opposed to each other through the piezoelectric film at the opposing electrode portions, most parts of the electrodes on the front and rear surfaces of the film which are different from the most parts of the electrodes at the opposing electrode portions being shifted from each other at the nonopposing electrode portions so as to have substantially no capacitance, and the piezoelectric film is wound around a base in an even number of layers such that the opposing electrode portions overlap each other and the nonopposing electrode portions overlap each other.
REFERENCES:
patent: 4028566 (1977-06-01), Franssen
patent: 4071785 (1978-01-01), Yoshida et al.
patent: 4330730 (1982-05-01), Kurz et al.
patent: 4413202 (1983-11-01), Krempl et al.
Funakoshi Akira
Hamada Akira
Ohira Keiichi
Budd Mark O.
Kureha Kagaku Kogyo Kabushiki Kaisha
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